Reusable fusible plug for hydraulic coupling

Abstract

The invention relates to the field of temperature protection technologies for torque limited hydraulic couplings, in particular to a reusable fusible plug for a hydraulic coupling. By the aid of the reusable fusible plug, the problem that fusible alloy for existing torque limited hydraulic couplings cannot be reused after being melted to relieve pressures under overload conditions can be solved. The reusable fusible plug has the advantages that ferromagnetic materials with standard temperatures at a Curie point are fixed into a valve spool and a valve seat by the aid of 'Curie effect' principles, so that the fusible plug is in a normally closed state, the valve spool can be opened and closed at temperatures higher than or lower than temperatures of protection points, transmission liquid in an inner cavity of the coupling can be quickly drained under the control when the temperatures reach the limit, and a closed working cavity can be formed by the inner cavity of the coupling after the temperatures are reduced; the fusible plug has a temperature protection function under overload conditions of systems and does not need to be replaced after the temperatures are reduced under shutdown conditions, the systems can be started only after working media are injected into the systems, accordingly, the fusible plug can be reused, and the operability of hydraulic coupling products can be improved.

Description

technical field [0001] The invention relates to the technical field of safety protection of torque-limiting hydraulic couplings, and is a reusable temperature protection device for hydraulic couplings after overload temperature protection, specifically a reusable hydraulic coupling fusible plug. Background technique [0002] Mine water medium hydraulic coupling is mainly used in the driving system of scraper conveyors and crushers. Due to its operating conditions such as frequent start-up, heavy load, and large starting inertia, etc., the operating environment is harsh and often occurs In the case of overloading, it needs to be shut down for maintenance every time, and a new fusible plug needs to be replaced. The system can only be started after injecting the working medium. Since the water medium hydraulic coupling is installed in the coupling cover, the fusible plug can be replaced with a new one on the narrow working surface underground. , the operation is very difficult...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a reusable fusible plug of a hydraulic coupling to solve the problem that the existing fusible plug cannot be reused after completing the temperature protection function when the hydraulic coupling is overloaded, and needs to be replaced with a new fusible plug , causing the problem of low operability of the hydraulic coupling, and the problem of accidents caused by the loss of safety protection of the hydraulic coupling due to inconvenient maintenance work

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